02262cam a22002897 4500001000700000003000500007005001700012008004100029100001900070245013100089260006600220490004200286500001800328520088800346530006101234538007201295538003601367690008101403690013801484690011001622700002201732700002401754710004201778830007701820856003801897856003701935w18715NBER20180222022619.0180222s2013 mau||||fs|||| 000 0 eng d1 aMichaels, Guy.10aTask Specialization in U.S. Cities from 1880-2000h[electronic resource] /cGuy Michaels, Ferdinand Rauch, Stephen J. Redding. aCambridge, Mass.bNational Bureau of Economic Researchc2013.1 aNBER working paper seriesvno. w18715 aJanuary 2013.3 aWe develop a new methodology for quantifying the tasks undertaken within occupations using over 3,000 verbs from more than 12,000 occupational descriptions in the Dictionary of Occupational Titles (DOTs). Using micro-data from the United States from 1880-2000, we find an increase in the employment share of interactive occupations within sectors over time that is larger in metro areas than non-metro areas. We interpret these findings using a model in which reductions in transport and communication costs induce urban areas to specialize according to their comparative advantage in interactive tasks. We presenting suggestive evidence relating increases in employment in interactive occupations to improvements in transport and communication technologies. Our findings highlight a change in the nature of agglomeration over time towards an increased emphasis on human interaction. aHardcopy version available to institutional subscribers. aSystem requirements: Adobe [Acrobat] Reader required for PDF files. aMode of access: World Wide Web. 7aN92 - U.S. • Canada: 1913–2Journal of Economic Literature class. 7aO18 - Urban, Rural, Regional, and Transportation Analysis • Housing • Infrastructure2Journal of Economic Literature class. 7aR12 - Size and Spatial Distributions of Regional Economic Activity2Journal of Economic Literature class.1 aRauch, Ferdinand.1 aRedding, Stephen J.2 aNational Bureau of Economic Research. 0aWorking Paper Series (National Bureau of Economic Research)vno. w18715.4 uhttp://www.nber.org/papers/w1871541uhttp://dx.doi.org/10.3386/w18715